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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5730accfd4a1c9418d7f5254a89d1364b3180b98410d831752f8302a4aefa2ba' 
  AND token = 'SbV1XjzC1ampFPQRCRfLFVkwdfCZn2YUm/uNPnvllic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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