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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057997bf75c1fb5df0f08bc80f3a7586178f4e40d3ad3ea2d87586293f88bccd' 
  AND token = '9qkDfFoPwg/AjYg6d9Tc75gMigLqvakcle2uM4z40sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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