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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b526f3c197f3cd6b2830e25a92978f6acac592ba64ca31cb941976297d1bb93d' 
  AND token = 'LuAkmrue7hsP6SODqQa3IA7YnhJK1LvIzuWAmuQnDrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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