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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2feed9cc1eedc3f68333c576cd14a8dd5f2a648ba63bd9aa2cd48f15e2ce992' 
  AND token = 'GqkbBfqeFCj6bwWDJUKosJj/pguMd6CiCsbLgT8nAxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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