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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9dc5257fce362c5acc472f21315bbc496fb1d09c5627f2059163f471c42584' 
  AND token = '+er7+fm8wtW/eu1N0ZGN2VRjNCOPUvmGpfK+448lINk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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