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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f191b9866b1c7826f5eab63eedbd9f5c2e8076720fe1b0d5c862d638aaf5878' 
  AND token = 'nvGubcMsmpedClB4f6r9aqaduX4sVQLispVq4cgv6kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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