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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2664e5e39a202dbc8e3bbc1291775464375e801078844d40386829c0e60b855' 
  AND token = 'rXP+zucp4Fcr1YX3lM7/63wUm66L5LvRdUDz75WBF2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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