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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3126bfb67e88297245e9aaf88d0d6374d28dd836841b796d1b9bb71d59bd5b' 
  AND token = 'CTfhCJoC+L/bWkMkw4M9/gwl9YCS4j0Jz6EoYmmhcg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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