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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65c9590a90656c92e091c285c749d181ca549c841b7a3fe78dd7e79cbe5095b' 
  AND token = 'OWROml1Tn2Nxg8bdM+6XLDNOGbEU8AqvT27710nDGag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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