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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3a990987c35657c7204a74154132a688a0b3036a0eafc05475b480a9c3daa8' 
  AND token = 'ghiHbcFyD0bxail8NCL6KSXZ+wSP4+aiFhnRifjuNM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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