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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9cc537b43d2b94cf3a4060a1e16b1986423652823188110fd8859427fffa86e' 
  AND token = 'R07QtxHbnWASypK4FFIkeAdOmW7YE0FRbSYJFtnf+G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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