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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce5ce294bfeda9b7a050379babd3ce30b44436b5b537082602973dda8c282ea4' 
  AND token = 'CQKmMLfJNDoa+k1S36mswVgZSheD+xiV1+JekIn+brM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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