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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2800dde041944f7e8cea5312664b4446f2c5fd14e025a3e3e077a66c2f78ef9' 
  AND token = 'vZ/woo3ZmlKIIAiraI2l3Gp+37VD3MsEX4c2h87chEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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