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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c06ffd63b7be24b9dfcb222ee8a5ec496e346a99574faf30f49c0297fbb767' 
  AND token = 'gLEX5Q8GDFdMrJs06E6Cs+998ry4c5oxlhgCBbCerto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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