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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59610dad1b2f696a6f5629548b4a0507ca6cbb7cde04254ad32365d6d0de6f57' 
  AND token = 'Opcg/7wJWXRmihuQV5bH0i2XL2PPmklurTWvPZOWpkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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