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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1548bda76ba257845f3a60084e1d3d9c2fd7eac598ea8454a0f984f5d093bef' 
  AND token = 'l32EoFaw5pN9NwcOLB8y8jweY062uqOTFMGvvX5kzn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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