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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '583a0f55a177d2b425416d3aefdd5b5e50930697498819cf0cc5be1b1bd9d372' 
  AND token = 'dRLbjaucpgeBTWuZO7lg0Uvx7nMzf2uo1tWbZf/vLjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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