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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5633cf83f1cc243df693d7dac1d0b414c32e5ba2fe737886c1267668e71e0866' 
  AND token = 'F3iA86rS6KyL1L/3BKznzkdHfY/kSkRB0rcALfeIXK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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