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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c203441fb983cabaad31eac9cdd9b4f9ab7f4c1db8ea3f47ce2c427c76dd72c0' 
  AND token = 'OKoA2aPufR/MoxRerSIhdhv8v+Qi6iTQDe0YReHTXyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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