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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e03a3fb6e1a0898837d3a8ad37d6874eef46c0bb445ad6797afd7107d1cf3a1' 
  AND token = 'kNg6WofYAAuocMd0JB3Y81we4lXK2NZ5I6A08VSjywg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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