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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e9ea001b10c9f0c42026f0c02e887f1feac57336ad3b2be43a9a137d1779034' 
  AND token = 'FdsOpB6xz/ODL+CiH8d58hPkHICTh6za75S2dCRQHkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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