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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08473852b0444c1ca83ee51c744be183f91d91914043a6b3e6341a1b06cdcd0c' 
  AND token = 'UYNTqlJ9HqQgFtgme+4s6ddCp3VxjYVHVR1ntgwforc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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