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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a292460db8a241e7f53d2a1dee463a15a6c6b8ce13c3e06203a48855765864' 
  AND token = 'uvEHAmdEeDjcaE7E+Y00iCmC9myb0/DyvKnYq1NTPBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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