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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cdb7f2164f87bab4669ae114253fa2d40eb353a6b18f3fa54dd343ad092c9d0' 
  AND token = '/BnT/e7kiDwJ/6j9w4v30W/YE1kgWQL7V63lTsJQ8tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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