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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c925d4ae131f0ed764d098b8ca36951c43034edff7ac68a620627ce1b27372a' 
  AND token = 'aTpa6dpwRs0aN8U1M+igpVBzzpyhGE4q9nWX47hZFpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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