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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '382ba2fbc4f68ffa4310b2a52052fc8ee0b1310ad50d6f706b2ca14ce79a523e' 
  AND token = 'w6yyDPXDGInIROSep6lm793uDxsMe0QpuG3MyS3PAZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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