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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b29b1c3fa9678a01fb9266981aaf0929b5e148cc78ded4fd2a7beb76e3be879' 
  AND token = 'k6kGrqWnTTUnr6ODW77jlpBBCoxNlJmF+BkJcV+akNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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