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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ed83205b846468d13ff99fc52f4da778f7dbb49c190aea26bcd06aa3594b94' 
  AND token = 'WdA3+hzUwmaVVyPIVjS00XHdDVRpVvHpjUf+Ra9pbvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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