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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '254b2c22899510b02d783ae071e0579a801d9588cf70d9b47e0313398fcbde47' 
  AND token = 'Y5jy3us3u4vbBllTFS5UpeQakbOvmVao5+V04M04IVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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