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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82437c6072e114c5ccaa71826a0eee7483ecd37ea7f84af3998ddd9cfce796c' 
  AND token = 'QHHift/aWYZfow4caYUCSzp/Pooy8u3ZF+sM54pzt3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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