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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd8ce4420e16338a707b47d7623734fcbe6c9b00e9dbb3f63cd23c4e7b8698d' 
  AND token = '6fBicdKRAyDP1wq8WLHDHyyA1TBFTz27VzYPcQfcAg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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