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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba13d429a9e44fd3bc514b5b840e894954c6d91f0ff1e4c309401f865ff308c' 
  AND token = 'CMok0EXZ1Jp+GE5BJqB0DcAvHe9hA8opry5gTrWuBpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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