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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f1a67c04f309419b6b90c62b140e4d4f487cabb0e1d716a9c4b7eb6bd4c5cf' 
  AND token = 'G4R6Dr7o5C+hSrjWxynUYNZWWPgaPDs+WfniKeLYeMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00110

JSON explain

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