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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c94feb3bfcddb7d1512970ef66b65ef88bb9790acfc2cf6ddccfdb2587d97dd' 
  AND token = 'Kr5vY8EhswpZ19KnCKq2tuerU6IRTRkB/BeIE9KGQNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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