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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32edabbf0d9c23be7c01326854a525172dc72e00e976060818bf35e7f8f256e' 
  AND token = 'U565X9fvtkoq1ADnGoUS+AkUF50Of6g1nuR2mF30nR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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