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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '865d52ef614f03e23355122254c0b5b284bf2457e7af051582cbb311cb43f79c' 
  AND token = 'c4I6jnMGid006SHUfgrgiImJazZ8tDCNWdQShMAhnoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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