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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7634c4dff70e10dcbddf47e2b505f47ed660ed221c156bd42222464d792a9e08' 
  AND token = '4ZckoFOwxOPXXV9Kyzm1jwOQFcz1rCGXNc7Hl/aEt7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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