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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a26f74d10e83c6479dc6d9240c3fd719713cf89f1f0b9ac23d86df38293175a' 
  AND token = '03htrPm8tv4mzSFRoN+WuOtQOwFgPOllsc114Ea26lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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