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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55868af88d35de6ccdaee013d39f47f3b77a27aed70814976424807509aa4377' 
  AND token = 'dLy72fdeJEoKGQx91yKR+79so/Xz2JRvW8ygppMpmbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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