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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e081eb4f4646d35e243741de719d2e080ce25dc033ff0bcb906712e0dba4c1c' 
  AND token = 'eDizBZJX6xqkT6wrFT+AiN+Pi/qwu/vpJx4U7rlMCiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}