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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a2869f5ceb414aa5af82f82e234b5fd1ae29778b9b5984a62b32bb48b478c0' 
  AND token = '1CFjjxha9n6zd1jo3tgDaoK5196284p3D7Cl9FoVw/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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