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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c9e179a26e3b6e746e3fe2075807360d31f5a7d25b386b30e7073188b1a83b' 
  AND token = 'TYbrbTioSxQERTmb9jGdTxRZIygK7ZzVyfNGrGVzANk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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