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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7411477baf9f9225c0ffd189d2d41eae81bfd958f5f854eb55dc0a2dc6744c0' 
  AND token = 'uOvpuYt/uDMl1L8nDC3/FEhxnGf4ZT1JgdzQtfwX3dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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