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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b577506007b042c424d369f0f4e4eac444111cf533a5e50878845c1b826aa6fb' 
  AND token = 'jqmP4ojlqRdNWWIAN3VdxomNh7M86iBlcIbsY3LrmCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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