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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cda589b44a65f0aadc5c834434f75834a8b0980bce482e92aceab44b8c1619a' 
  AND token = '7m4o+eKZk61AzJuCfF6mdH9w/lTiaLj1Eu4gic4ICBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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