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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1036a7f7061c1e09428d918a4a2a1619b23b5973c6a37b0b5746286de6d9537d' 
  AND token = 'DTrnL0yOIXYvFInX2fGQ4WooLXikpT+2jXPW9ywu5Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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