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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3401f1f40fcbdd607780b61dadeeec9de1fdf8e38dbee0d08e602cc1a3a502f' 
  AND token = 'm6CxQSyYlgXe0WZ7jeJ0mqo4Ojvp8I+wL/W0l3Cs7ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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