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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ae923b25bef1d65412d5ab3a0472d27a812d45e1573d250e614fb2d984b707' 
  AND token = 'TWwQY4QPLUju8oGTS9sa1a7gkDBMoJeuI7Xm4r13++I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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