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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36b663bb31b93a52e3aae2084b74593732e1c8ac58223cdc54dbec04a6bd8be' 
  AND token = '0tTrRTtfNDRvw/KCfIP5PWSHvJh3/FPLjKueH4Cx8Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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