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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f507527e260835d03616639322f27ffb8221b53cb1517a366d96f24d8b32ce' 
  AND token = 'MpYwbSyf7jxEtVsHrCd9unNpmFu+KSMc414d0ypPrAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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