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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66dbb9d2cd0ea6d5ae7079634bb1cdec3a16c997b85a725609dfd63e3b4844a6' 
  AND token = 'e5AwN/s0gF4r4JocgtzS9qHvhkgmzCCpF5Zn1cHgK8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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