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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e41faac5eb8752ffc7703ad3a73b660b39bd5cdafe0b267fc7679b28f383c9' 
  AND token = 'X9RqIuctyaM2Wwz9yJomhjwyAkgrDo9q0f3TfnnI07M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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