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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55b5a867ffc45d07e715a7cd76971c12078a720db7fb9e2d9c8958d0d134f2f' 
  AND token = 'YexEh18wAilcGRnCTXVRE9/qQ/R1i+cWYG+6mbO6nx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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