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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8166932845112d4e628efb4bd91bd1c9c6dd55f8932bb53ac8c177b77723c39e' 
  AND token = 'WN5yRHPv/Gzum7kRQaCtnLWKFxD90Ml1qslh0TVb7lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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