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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5cb36fe2a80d285b40b620199cf9353dce2d7ca1ff6df2d77633871da5489e2' 
  AND token = 'VCyy/hQ7dT/MUOe1ROh6MNh/TPvcuX2tyNWwg22PIDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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