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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c192aa17821c534d419391241f0bb0a6762f6c3d78164c8665484d1584591742' 
  AND token = '7VJUPPWhd7W1GNH3kWk5SXMnai4vHXH2na5dbQ4wrq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00115

JSON explain

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