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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c921cd594bb3799c88f78747d8982f9e07850e3b67e32068db964b24250f0b9' 
  AND token = 'KCG113Uyzk0X+GZQINY2umkZPf92EWj8ttybJCC4+8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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